real() function in C++

The real() function is defined in the complex header file. The real() function is used to find the real part of the complex number.

Syntax:

template<class T> T 
    real(const complex<T>& z);

Parameter: This method takes a mandatory parameter z: which represents the given complex number.

Return: It returns the real part of the specified complex number.

Below programs illustrate the above function:-

Example 1:-

// C++ program to demonstrate
// example of real() function.

#include <bits/stdC++.h>
using namespace std;

// driver function
int main()
{
    // defines the complex number: (20.3 + 4.9i)
    complex<double> realpart(20.3, 4.9);

    // print the complex number
    cout << "Complex Number = "
         << realpart << endl;

    // prints the real part using the real function
    cout << "Real part of the complex number is ="
         << real(realpart) << endl;

    return 0;
}

Output:

Complex Number = (20.3, 4.9)
Real part of the complex number is =20.3

Example 2:-

// C++ program to demonstrate
// example of real() function.

#include <bits/stdC++.h>
using namespace std;

// driver function
int main()
{
    // defines the complex number: (2 + 2i)
    complex<double> realpart(2, 2);

    // print the complex number
    cout << "Complex Number = "
         << realpart << endl;

    // prints the real part using the real function
    cout << "Real part of the complex number is ="
         << real(realpart) << endl;

    return 0;
}

Output:

Complex Number = (2, 2)
Real part of the complex number is =2